Premium Quality: 3 piece hex wrench set is made of heat treated chrome vanadium steel for strength and durability; Hex keys coated with black-oxide finish resist rust and corrosion, which stands up to tough place. Chamfered ends helps guide the wrench for a smooth, easy entry into the fastener. 25 PCS Multiple Size: The 3-pack allen wrench sets comprises an 9-piece SAE set : 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4"; an 8-piece METRIC allen wrench set : 1.5mm, 2mm, 2.5mm, 3mm, 4mm; 5mm, 6mm, 8mm; an 8-piece TORX wrench set : T9, T10, T15, T20, T25, T-27, T30 ,T40. With this kind of range of sizes you will have a hard time finding a job you can't tackle. Compact Design: Each small folding allen wrench set mini is compact and lightweight. Keys are designed to resist rotational distortion and rotate 270 degrees for better access and torque.It is easy to carry in your pockets or tool box. Ergonomic and Comfortable Handle: Allen key sets feature an ergonomic grip offers better leverage and torque, you can tighten screws and bolts more effectively and swiftly. Versatile Tools：Folding Allen Wrench Key Sets are useful tools and small enough to go into the tight space where traditional hex key can not reach. You can use them to easily tighten or loosen the bolt and nut, suitable for auto repair, DIY project, and household appliance maintenance, and can also be used as bike allen wrench set. HAUTMEC 25-Piece Folding Allen Wrench Set, SAE/Torx/Metric Hex Allen Key Set, Heat Treated Chrome Vanadium Steel Allen Wrenches Sets for Basic Home Repair and General Applications, HT0388